var OS_Common={
	is : function(obj, type) {
		return (type === "Null" && obj === null) || (type === "Undefined" && obj === void 0) || (type === "Number" && isFinite(obj)) || Object.prototype.toString.call(obj).slice(8, -1) === type
	}
	,
	eval : function(str)
	{
		if (!window.$starttime) window.$starttime=(new Date()).getTime();
		window.$time=(new Date()).getTime()-window.$starttime;
		try{
			var value=eval("("+str+")");
		}
		catch(err)
		{
			var value=null;
		}
		return value;
	}
}
